http://www.legislation.gov.uk/apni/1933/5/section/3Destructive Imported Animals Act (Northern Ireland) 1933An Act to make provision for prohibiting or controlling the importation into and the keeping within Northern Ireland of destructive non-indigenous animals, for exterminating any such animals which may be at large, and for purposes connected with the matters aforesaid.texttext/xmlenStatute Law Database2021-07-21Expert Participation2020-12-31 3The Ministry of Agriculture may at its discretion—aupon payment by an applicant of the prescribed fee, grant to him a licence in the prescribed form authorising him to import and keep, or to keep, musk rats in accordance with the conditions of the licence and with the regulations, and from time to time renew any licence so granted; andbrevoke any such licence, if it is shown to the satisfaction of the said Ministry that the holder thereof has failed to comply with any condition of the licence or with any of the regulations, or has been convicted of an offence under this Act.